with blues, so I wait until I have at least a "small" load of them and wash them separately from blues

and greens, otherwise I get something like "olive" or

"burple", as the grandkids call it,

if there is a single NEW item that slips past me.

Some sale cotton items bleed colors like mad, as do

some of the "older " garments the kids like to pull from the spare closets/boxes and wear as they become "cool" within their generational fads. Those fabrics are NOT reliably color-fast, believe me. Be careful and on the safe side.